Topic 3: Electricity

Question 1

Ammeter

Answer 1

A device used to measure electric current

Question 2

Cell

Answer 2

Provides electrical energy to charges in a circuit

Question 3

Battery

Answer 3

Provides electrical energy to charges in a circuit

Question 4

Voltmeter

Answer 4

A device used to measure voltage or potential difference

Question 5

Variable resistor

Answer 5

Used to vary the size of current in a circuit

Question 6

Motor

Answer 6

Converts electrical energy to kinetic energy

Question 7

Switch

Answer 7

Allows current in a circuit when closed. Used to switch on circuits

Question 8

Bulb

Answer 8

Converts electrical energy to light energy

Question 9

Resistor

Answer 9

A component that restricts the flow of electrical current

Question 10

Solar cell

Answer 10

Renewable energy source. Provides electrical energy to recharge batteries

Question 11

Fuse

Answer 11

Melts to break the circuit if the current is too big

Question 12

Diode

Answer 12

Allows current to flow through in one direction only

Question 13

Capacitor

Answer 13

Used in electronic ampilifiers and timing circuits

Question 14

Light dependant resistor (LDR)

Answer 14

Resistor whose resistance changes with light falling on it

Question 15

Thermistor

Answer 15

Device where the resistance will change with temperature

Question 16

Speaker

Answer 16

Converts electrical energy to sound energy

Question 17

An ammeter is used in…

Answer 17

Series

Question 18

An voltmeter is used in…

Answer 18

Parallel

Question 19

As we increase resistance, the current…

Answer 19

Decreases

Question 20

As we increase voltage, the current

Answer 20

Increases

Question 21

Electricity

Answer 21

The presence or flow of charged particles

Question 22

Ohms Law (formula)

Answer 22

V=IR

Question 23

Voltage (V) unit

Answer 23

Volts (V)

Question 24

Current (I) unit

Answer 24

Amps (A)

Question 25

Resistance (R) unit

Answer 25

Ohms (Ω)

Question 26

More voltage =...

Answer 26

More current

Question 27

More lamps in a circuit =

Answer 27

Less current but more resistance

Question 28

Current in series

Answer 28

Current is the SAME at all points

Question 29

Will a series circuit stop if there is a break?

Answer 29

Yes, current will stop at all points

Question 30

Relationship formula for series circuit (current)

Answer 30

Is = I1 = I2 = I3

Question 31

Current in parallel

Answer 31

Current is DIFFERENT at some points. Branches all add up to the supply circuit

Question 32

What does current do in a parallel circuit?

Answer 32

It splits and rejoins to return to the supply

Question 33

Will a parallel circuit stop if there is a break?

Answer 33

No, the current can still flow in other branches

Question 34

Relationship formula for parallel circuit (current)

Answer 34

Is = I1 + I2 + I3

Question 35

Two equations to calculate power

Answer 35

P = E/t & P = IV

Question 36

Energy (E) unit

Answer 36

Joules (J)

Question 37

Time (t) unit

Answer 37

Seconds (s)

Question 38

Power (P) unit

Answer 38

Watts (W)

Question 39

What is UK mains voltage?

Answer 39

230V

Question 40

What does the number of electrons determine?

Answer 40

Current

Question 41

Voltage in series

Answer 41

Voltage SPLITS and rejoins to the supply circuit

Question 42

Voltage in parallel

Answer 42

Voltage stays the SAME at all points

Question 43

Voltage in series relationship formula

Answer 43

Vs = V1 + V2 + V3

Question 44

Voltage in parallel relationship formula

Answer 44

Vs = V1 = V2 = V3

Question 45

Potential Energy

Answer 45

Ep, is the energy gained by a mass, m, while rising to a height, h, working against a gravitational force.

Question 46

Potential Energy formula

Answer 46

Ep = mgh

Question 47

Energy unit

Answer 47

Joules

Question 48

Kinetic Energy

Answer 48

Ek, is the energy which an object of mass, m, possesses by being in motion at speed, v.

Question 49

Kinetic Energy formula

Answer 49

Ek = 1/2 mv²

Question 50

Work Done

Answer 50

Ew, is the amount of energy it takes to do a task.

Question 51

Work Done formula

Answer 51

Ew = Fd

Question 52

What does F also equal in vertical motion?

Answer 52

W=mg

Question 53

Distance also equals...

Answer 53

height